In Irish Gaeilge:
Ár n-athair ár gcara
In Scottish Gàidhlig:
Ar n-athair ar caraid.
In Gaelic, you can say "mo chara anam" to mean "my soul friend".
athair
Bí i do shláinte.
In Irish Gaelic 'mo chara' means 'my friend'.
You have a friend. Tá cara agat. I have a friend. Tá cara agam.
Mic mo chroí in Irish.Mic mo chridhe in Scots Gaelic.
In Irish (Gaelic) and Scots Gaelic 'father' is athair[ahir].
In Irish it's "Is cara iontach thú"
You need to specify Irish Gaelic or Scottish Gaelic: they are two separate languages.
Irish Gaelic has seanchara (old friend): the closest Scottish Gaelic found is seann-eòlach (old acquaintance)
Lá na nAthaireacha Sona Duit
The Scottish Gaelic is do charaid.