Just echoing other people's thoughts on this advert.
I have just watched it, and would have taken it as others ... never would have considered they were depicted as 'gays' at all ... just thought it was a clever way of showing what us mothers feel like sometimes when the family needs feeding. The kiss just made me laugh .. particularly when the Deli man calls him over to say "Haven't you forgotten something". How many times have us women said that.
Offensive .. not at all. As for explaining it to the children, not difficult for me as this is the way I saw it.