I grew up that way with my sister (younger than me by 16 months) and then when my brother was born (five years younger than me) and my youngest sister (11 years younger than me) came along, they joined the pack. We were The Kids. We shared everything. We are still extremely close and I am so glad for the closeness we had and continue to have. I wouldn't want to live any other way.
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My DD and DS are 16 months apart and they do. absolutely. every. thing. together. They chat and run and play and work together all day. We are homeschoolers too and I'm not worried. Trouble making is truly a part of this age...I really believe that. My DD eggs my DS on all the time...we're pretty lax about mischief around here, so as long as it isn't straight up dangerous, it's pretty cool with us. We do live in the middle of nowhere, deep in the woods, though....so it's a lot of all day rough and tumble outside...which sounds a bit different than your set up.
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I would also say that I have noticed, when they are in a group of kids, that like a PP said, my kids tend to split and play with all the kids. If, even in a larger group of kids, they tend to go off and isolate....I may try to encourage another kind of play with other kids...but I would never ever actively discourage closeness. My mother and her brother were like that growing up and my siblings were like that and now my kids are like that....I see that as a long history of close sibling groups and it makes me proud. Our family is extremely tight and nobody ever has to worry about going through anything alone. We don't all live around the corner from each other or anything...but when one of us needs anything, the call goes out and the troops come in. It has been amazing to grow up and have each other as support. We don't just talk about stuff...we can talk about REAL life. I can sit with my brother and ask him "what does it feel like, to be a man in this world" - and he will talk to me for hours and I gain understanding about my husband and vision in my parenting of my son from his wisdom. I can REALLY talk to these people and share ANYTHING with them...they are like little pieces of me. It is so valuable to me, that these people, who have known me inside and out since I was an eight year old, shaking a stick at a bully in our neighborhood, have all of that history to serve as context. They are as much a part of my growth as a human being as my parents were...maybe even MORE important, because they never treated me like "just a kid"...they were my peers, my followers, my leaders, My Crew. They will always be that.
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The world can be hard and cold. You can't always trust that people will be who they say they are....sometimes you can't even trust your own damn self. But I know I have three people walking this earth who know me completely, trust me without question and would be there to defend me through absolutely anything. There are people who can't say that. The same wild haired, freckle faced little girl who climbed into a drainage ditch to save my music box because the water scared me....is now a brave, bold woman who bakes for me and sends me little scrawly notes when I'm going through sad times. The sweet, charming little boy who would have followed me to the ends of the earth and who never told on me one single time growing up...is now a worldly and wonderful man, who swaps farming notes and cooks with me. My sweetest, smallest little sister...who rode for miles in miles in our wagon, and was the best as sneaking food out of the house, is now the best aunt in the whole world...and fills me with awe at her creative capabilities. I learn so much from her, it knocks my socks off.
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OP....go with it. We were GOOD kids and we're all good adults...if you could have seen some of the trouble we got into as kids, you would shriek. I really, truly think it's normal.