No need to rush mine are almost 6 yrs apart in age and are the best of friends when it matters most they have each other’s backs. I’ve seen the older kids my daughter plays with hurt her feelings and my son gets on them for it these kids are from 11-13 in age and he’s just 5 sticking up for his big sis. And when he’s sad or hurt she’s there for him like a little mama bear. They fight of course like any other siblings but when it’s important they have each other. Which is a lot more than I can say about my sibling who is 11 months younger than me we don’t even talk I haven’t heard a word from him in over 2 yrs he has an almost 2 yr old son I’ve never even seen I’ve only seen pictures our dad and sister show me.