It's a mixed bag!

POSITIVE: He loves to read (inspiring a love of books/stories in his sister), loves to make art (which inspires his sister to paint and draw for hours) and he loves to spend time together as a family (making it possible for us all to hang out for hours).

NEGATIVE: He can say mean things to her that she parrots back to him (and us), when he refuses to eat a meal then she will refuse it too (even if she likes it), when he refuses to sleep then she will too, etc.

Basically she copies everything he does... when he's doing something we want then it's great, but when it's something we don't want... then it's not so great! Hard to tell how it nets out, but I try to remind myself that there's lots of positive to go along with the negative!!

Is your eldest a positive influence on your younger children?