Mambo child theme – should I do it?

Sorry if this question is too noob, but is it safe to work with a child theme of Mambo (which would then in fact be a grandchild theme of Rambo)?

I am asking because I have read this: https://wordpress.stackexchange.com/questions/65852/is-it-possible-to-make-grandchild-themes

which basically says that sometimes it’s not a good idea to produce a grandchild theme.

Thanks