My toddler is 2. I bought a wooden highchair at a recent auction and it works GREAT as a booster style chair - it's higher seating than a 'regular' chair, but he doesn't have a high chair tray in front of him separating him from the family table.
He sits and eats wtih us at meals. He stays at the table til he is excused (he'll sign 'may i be excused') or til the dinner bible reading (one chapter) is done.
He's always sat at the table with us as soon as he was big enough, so it was gradual for him. his little brother is now doing similarly.
I would suggest maybe gradually encouraging toddler to stay at table longer - maybe let him color or something - to get him used to the idea??
((hugs)) I think it's all about what works best for your family, personally. I just got in the habit with ds at table from 'the beginning' so it hasn't been a hard transition to stay at table. Sure, there are some nights, ds doesn't want to stay at all, and if it's a big hassle, I let him go play instead, but those are rarer and rarer anymore. (Now watch, the next 2 weeks, he'll do that and not sit at table, lol.)
My son still isn't able to sit in church services - and I've seen other 2 year olds that can. Each child is different. Work with your child's uniqueness.
It'll be rare if he's unable to sit at table when he's 18. . .
BettyAnn