I think this is a forgotten classic...
I agree 100%....this is one of my favorites......The opening speech at the self-help seminar is classic (I quoted it in my college graduation commencement speech).....and the jokes throughout are well-done and often smartly satirical....the boys are fabtastic as well as Mom. This is in my top 10 of all time.
I saw MOTHER'S DAY as part of a double feature with DAWN OF THE DEAD. As far as I'm concerned, it was money well spent.