I understand as the new baby is special to you too,but maybe they could just 'call in' before their lunch to give you your cards& gift or whatever you usually receive,and let you take a memorable photo of you all together? Then they can go off to lunch? Sounds like a good compromise? (I hear others saying your SiL is caring,but maybe he could have cared enough to ring you and suggest you ALL went out for lunch together,to help celebrate the first mums day with the new baby?) Hes put your DD in the position of having to choose,not you,yes i can see other posters seeing hes a good man etc,but hes also manipulated her into this,just to keep them both to himself,(after all babys not going to remember it?) & what about his own mum? Does he not have one? If not he wont understand why its special to you either..yes i have DD's,and DiL and they do often do things with their own kids on mothers day,but im sometimes included( we dont live near) and their kids are not new babies,you would have thought the SiL would be wanting to also include you,even a little bit,in their day,as a thanks for helping make it possible to have their special child,and let you see baby too!!