Filia vobis ipsis/ ipsa

[john abshire]

Filia vobis ipsis litteras scripsit.
Book translation > Your daughter wrote a letter to you yourselves.
how do you know it is “your” daughter? Assumption?

Filia vobis ipsis litteras scripsit.
His daughter wrote a letter to you yourselves.
Could this also be valid?

Filia vobis ipsa litteras scripsit.
His daughter wrote a letter to you herself.
??

 

[cinefactus]

It could be someone else's daughter, if it were following on from something else although you could make it clearer by saying filia eius.

For the last question, yes.