Fòram na Gàidhlig

I need some help to get this right, the wife and I want to renew our wedding vows and we agreed to use this:

Is tu fuil ‘o mo chuislean, is tu cnaimh de mo chnaimh.
Is leatsa mo bhodhaig, chum gum bi sinn ‘n ar n-aon.
Is leatsa m’anam gus an criochnaich ar saoghal.

Which I was told literally means:

You are blood of my veins, you are bone of my bone.
Yours is my body, that we may be one.
Yours is my soul until our worlds end.

We want to add the first and last line again at the end to include our 2 children:

You (two children, one boy one girl) are blood of our(my wife and I) veins,
you are bone of our bone.

Yours are our souls until our worlds end.

In english the transition fron singular to plural is not apparent when you look at the verb, but does it change in gaelic or is it just a matter of replacing mo with ar?

We get some help with the pronounciation from a gentleman here in Germany, but is not 100% sure about the grammar.

Could someone here please put the additional 2 lines back in to gaelic for us.

Thank you very much in advance.

Eric and Daniela

Is sibh fuil ‘o ar cuislean, is sibh cnàimh de ar cnàimh.
Is sibhse ar n-anam gus an crìochnaich ar saoghal.

Yikes, typos... if part of a word, thy apostrophe should never be a right-curling apostrophe and in front of 'o it's totally pointless - so summing up:

Is tu fuil o mo chuislean, is tu cnàimh de mo chnàimh.
Is leatsa mo bhodhaig, chum gum bi sinn ’nar n-aon.
Is leatsa m’ anam gus an crìochnaich ar saoghal.

Is sibh fuil o ar cuislean, is sibh cnàimh de ar cnàimh.
Is sibhse ar n-anam gus an crìochnaich ar saoghal.

Thank you for the quick reply