You can use lemon EO in place of the TTO in all cleaning products. I dislike the smell of TTO and only use it when I want/need the therapeutic properties. ANY EO is good for cleaning. For that matter, I don't even use EOs at all in most of my homemade cleaning products.
Clary sage is not appealing to me, either. I only use it in blends with EOs I do enjoy. The good thing about EOs is you can literally use one drop and it will provide therapeutic properties. So, add that one drop of clary sage and then add some other EOs you do enjoy.
Aura Cacia (AC) is not a great brand. Sorry.
I've owned quite a few brands of EOs, and for long enough to know when and how fast they go "off", which is honestly the only way for the average person to tell if an EO is good quality (unless they have reactions and delve deeper). There are lots of tests and reading one can do, but experience is the best indicator. In any case, the AC EOs go "off" in shorter time than most other brands I have used (all treated the same: dark location, lids capped tightly, smallest bottle possible, etc). And, those caps and orifice reducers are soooo annoying! They receive an extra penalty from me due to the waste factor! I actually have a few NOW brand EOs that have lasted longer (in terms of potency and proper scent). If I need an EO quickly, I will buy NOW versus Aura Cacia. Otherwise, though, I stick to the sources I stated above (earlier in the thread), which are all definitely higher quality than both of these brands.
You may be interested to know that ALL citrus EOs and pine EO will lose potency the quickest, regardless. So, unless you plan to use a lot for something specific, it is best to only buy the quantity you will use within a year or two, depending on how often you open the bottle and how you store it, etc. Better quality will last longer, but still only buy what you can use up, or split the original contents immediately to several smaller dark glass bottles and label them. Exposure to air is one way they lose potency and go bad.
For leg pain, it will depend on what is causing it...finding the source and eliminating it is first on the agenda. It often is growing pains in kids, though, and we don't want to "eliminate" the leg or the kid.
Making a salve or healing oil with arnica infused oil and St. John's Wort infused oil will do wonders along with a parent's healing massage. (You can look up how to make sun-infused oils or buy them.) Avoid open sores with arnica externally. Taking homeopathic arnica can also help. If he also has dry skin or other issues, you can add other "goodies" to the salve or oil to deal with them all at once. Salve is more convenient to use for some folks, but takes more work upfront to make. Personal preference is what matters.
Tea tree - can be applied "neat" (directly to skin without dilution); heals skin; good disinfectant; lots of uses, but you gotta like the scent or just use one drop. I mix TTO half & half with lavender EO (the other one that can be used neat) and put it in a teensy weeny glass vial and keep it in my change pouch in my purse for "owies". A single DROP works like a charm and won't harm your LOs. Don't use it every day or go crazy with it, take breaks, mix up a different batch once in awhile with a carrier oil and different EOs, etc...for prudency purposes.
Lemon - must be diluted with a carrier; causes photosensitivity, so don't apply to exposed skin when you will be outside much (your time will vary); excellent cleanser/freshener/etc. I put it in my water when traveling. It helps me with car sickness on winding mountain roads and seasickness on boats. I use Camden-Gray's wildcrafted lemon EO and Mountain Rose Herbs organic lemon EO for internal purposes. I use a fresh squeezed lemon when practical, but that's really messy when traveling most of the time. I also make citrus-vanilla sprays and bath salts pretty often. This is my DD's favorite scent that I make and I enjoy it a lot, too! I make it different each time; using all my citrus EOs in a base of homemade vanilla extract to "anchor" the top notes of the citrus, then add to water for a spray or to epsom salts for a bath soak.
Clary sage - must be diluted with a carrier; good for lots of "female" issues; also good for lots and lots of other things, but I honestly just don't enjoy it much. I add one drop to blends I make up and will add less than recipes call for when I bother following one. LOL From experience, I don't recommend it in deodorant.
Rosemary EO is much more effective. Just sayin'!
Balsam fir needle - must be diluted with a carrier; nice scent for creating a winter, woodsy feel; good cleaner and other uses. I'd avoid this on the skin, personally.
Cinnamon leaf - must be diluted with a carrier; can be very strong, especially for children and those sensitive to "warming" elements; great scent for homes; can be great for other things, but I cannot use it and have not experimented with it. I use cinnamon sticks instead and grind them, when needed, or simply use them whole. I have a bath salt experiment going with a cinnamon stick infusing in a quart of Epsom salts along with other "goodies". I make a cough syrup / cold & flu formula syrup with elderberries, cinnamon sticks, echinacea, and honey (adapted from Crunchy Betty)...It is a little strong on the cinnamon for me, but works well for others.
Candy Cane blend - If this is JUST EOs, then it needs to be well diluted with a carrier (some AC blends already have a carrier); the jury is out on wintergreen EO for me. I have read a lot of authors on aromatherapy and almost all of them say it is not appropriate (or worse). If I already had this blend, I'd stick to scent uses. In a bowl of baking soda in the winter or in a spray used to wipe down non-food zones or as a refresher for potpourri (does anyone use these anymore?)...
I hope this helps! EOs are so fun! Look up each of your oils on Mountain Rose Herbs to learn more. AC even has an app...