Is Ceanadach mé.

Tá mé ag obair in oifig. Is maith liom ceol traidisiúnta na hÉireann. Tá triúr iníonacha agamsa agus ag mo bhean chéile.

To translate the English possessive "have", you need to use the construction "Tá [thing possessed] ag [possessor]". "Tá" is part of the verb "to be" and "ag" is a preposition roughly corresponding to "at" in English, so you literally say "Three daughters are at me and at my wife".