Just check on eisean/ ise. There's lots of times when I felt I have been living a lie with Irish; the biggest lie of all was the time I found out the Irish we were learning in school wasn't actually the Irish language of my region at all and the fact that we were never thought how to pronounce words properly.

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

Mostly because I'm an interfering busibody.

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A language belongs to its native speakers, and when you speak it, you are a guest in their homes.
If you are not a good guest, you have no right to complain about receiving poor hospitality.

Lol! At least you can admit it! ;P

But have they learned how to form relative clauses? I doubt it. And we all know that relatives in Irish are a bit less straightforward than in mainstream European languages.

"The eldest in the family" would tend to be the father or mother, so unless yu want to add 'páiste' or something, I would make it "the youngest" in the family" (easy way out). I don't think "an té" (cf Labhrás) is appropriate in this context, so I'd suggest: Aimsigh duine atá ar an duine is óige sa teaghlach. (Or ina t(h)eaghlach).)

They won't be familiar with that way of expressing the superlative though, so, using the relative of the copula: Aimsigh duine arb é/í an duine is óige sa teaghlach (é/í). I don't think the final é/í is necessary.

(Open to correction as ever.)

This sentence feels wrong.
ar(b) is an indirect relative, (first) duine is subject and antecedent of the relative clause ...
So, a direct relative* is necessary (... is ...),
I don't think a resumptive pronoun (final é/í) is possible here at all. (But it would be necessary for an indirect relative)

But ...
Aimsigh an duine is é an duine is óige sa teaghlach
doesn't feel any better (too complicated, as well as my own suggestion above (... an té atá ar an duine ...)

Simplified and sufficient:
Aimsigh an duine is óige sa teaghlach

*) An indirect relative copular clause with a subject as its antecedent is only possible when a "fo-ainmní" (sub-subject) is used in non-relative constructions (which is turned into a resumptive pronoun in the corresponding relative clause), i.e. in classification sentences only:
Is múinteoir é an duine = the person is a teacher
->
an duine ar múinteoir é = the person who is a teacher

Yes, I can tell a direct relative from an indirect - rocket science it ain't - and I know that it's a direct relative in this case. However, it seems the indirect structure is used in identification sentences whether the relative is direct or indirect. Not that I've seen this in any grammar book - just my (admittedly limited) experience.
Labhrás, google "arb(h) é/í an" and "arb(h) iad na" and you'll see. Many of them are genuine indirect relatives of course - genitives and occasional datives - but at least as many are technically direct relatives.



Not only does it not feel any better. It's just wrong.



But this isn't at all what MsHollywood is looking for and is no use to him/her. Read the original request again.

Actually, I'd been wondering if my version could be shortened to Aimsigh duine arb é is óige sa teaghlach and then I came upon this in a 'Tráth na gCeist' book based on a quiz competition on RnaG: Cé a bhain rás 100m breaststroke ag na cluichí Ollimpeacha i 1988 agus arb é is gaiste sa domhan a bhfuii an fad sin snáfa aige?

I think it is



Oh, you are right.
There are really examples of "arb é an X é" "which is the X"
So I learnt something new. GRMA.