Rusty takes a big brother attitude towards Donny Hopper (who we will meet soon) as he sympathizes with him - both happen to be an only child and both have overbearing mothers.
And here, Cousin Eddie returns and his mother, Sarah, is with him! I should emphasize that Sarah and Crystal were good friends before the two of them found husbands; Sarah used to live in Sunnyville and, in fact, it was Crystal who introduced her to her future husband, George.