Sinn or muid?
Either should be acceptable.
'tá muid'. I never saw or heard 'tá sinn'
Presumably because sinn is mainly used in Munster, and Munster also prefers synthetic forms like táimid.
I see. thanks
Would Tá muid bródúil díobh be another acceptable answer?
Nope. In Irish you are proud 'out of' someone.