You get "let off" Lent on Mothering Sunday which is also known as "Refreshment Sunday", the idea being a little break to keep you going with the abstinence up to Easter. I'm all for "refreshment".
Mothering Sunday/Mothers' Day does raise one problem once you are a mother of tinies though - who does what for whom? Couples have 3 mothers to take into consideration Mum and 2 Grans and if they all live a distance away, well, it can cause divided loyalties. DD (eldest) said today that she is at her wits' end re the next few weeks - there are the birthdays this weekend, so party Sat night and family lunch the next day and then (God knows why) they have the builders moving in on Monday and work starts on reconfiguring their kitchen/dining area/everyday living room. Mothers' Day is the following Sunday so they can't host. SIL wondered if they should do something for other gran and me, but I think what they need is a nice quiet Sunday for themselves well away from the kitchen chaos, just them and the boys. Other gran has a daughter living nearby so is "catered for", I will be in London meeting youngest for lunch then going to She Stoops To Conquer at the National (Christmas present to DH and self) But like the "who goes to whom for Christmas " debate many of us have experienced - why the pressure? Send me a bunch of and ring me up to say hello and I am happy. (I also used to be incandescent at the inflated florists' prices when our Ds were little)