Realistically, you would have to say "an scarann tusa agus do chailín?"
'You' sound emphatic to me- why was 'tusa' not accepted
I never remember that "AN" prior to the action to make it a question. :(
Any thoughts on "an scaran sibh tú agus do chailín?"
A verb can only have one subject. You appear to be trying to make both sibh and tú be the subject of scarann.