Dia daoibh aríst 'chuile dhuine. Táim ag cleachtadh an copula arú inné agus tá céist bheag a'm.

If I wanted to say Your father is a farmer I would say Is ferimeoir (é) d'athair. and if I wanted to say Isn't your father a farmer? it would be Nach ferimeoir (é) d'athair?.

Am I right in thinking that the é is not a must have for the sentences to be correct?

'maith agaibh

The é (or í) is not required in the Ulster dialect, but it IS required everywhere else.

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Múinteoir Gaeilge - Irish Teacher
My "specialty" is Connemara Irish, particularly Cois Fhairrge dialect, but I can also speak Ulster and Munster Irish with native-level pronunciation.
Is fearr Gaeilge ḃriste ná Béarla cliste, cinnte, aċ i ḃfad níos fearr aríst í Gaeilge ḃinn ḃeo na nGaeltaċtaí.
Gaeilge Chonnacht (GC), go háraid Gaeilge Chois Fhairrge (GCF), Gaeilic Uladh (GU), Gaelainn na Mumhan (GM), agus Gaeilge an Chaighdeáin Oifigiúil (CO).

Another way,

Feirmeoir is ea d'athair.

Would I be right in saying this is the usual way of saying it in Munster Irish?

Yep, except it would be t'athair

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Please wait for corrections/ more input from other forum members before acting on advice

And also t'athair in Conamara.

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Múinteoir Gaeilge - Irish Teacher
My "specialty" is Connemara Irish, particularly Cois Fhairrge dialect, but I can also speak Ulster and Munster Irish with native-level pronunciation.
Is fearr Gaeilge ḃriste ná Béarla cliste, cinnte, aċ i ḃfad níos fearr aríst í Gaeilge ḃinn ḃeo na nGaeltaċtaí.
Gaeilge Chonnacht (GC), go háraid Gaeilge Chois Fhairrge (GCF), Gaeilic Uladh (GU), Gaelainn na Mumhan (GM), agus Gaeilge an Chaighdeáin Oifigiúil (CO).