Elizabeth Armstrong (Bruce) - Surplus children of Robert de Brus 5th Lord Annandale & Isabel de Clare

According to Medlands, our generally trusted resource, Isabel and Robert de Brus had but 2 children: Robert 6th Lord of Annandale and Richard.
According to Wikipedia they had up to 6 children listed as:

Robert VI the Bruce, Earl of Carrick
Richard Bruce
Lady Isabella FitzMarmaduke
Lady Constance Scot de Calverley
Sir Bernard Bruce
William Bruce

So, being on the generous side and accepting the Wikipedia claim that still leaves surplus children connected that should probably be detached if no reliable sources are forthcoming. These are:
Elizabeth Armstrong
Ada Bruce
Christian de Brus
Marjorie Bruce, Princess of Scotland
John de Brus

I will leave these attached for a short time but if I receive no reliable sources from other users I will detach these.