They don't know where home is.
You know they are going to keep coming back, and despite the fact they are weaker each time, you still don't look forward to them.
Ant-Eye Biotics (Dad joke, I know)
Both are a play on words.
Caps and robbers
You were adopted. Best told to siblings :D
Self-raising flour
A bat!
Because he can't run home
No home oh
Because he forgot his voltmeter at home.