@7circlemats - Not sure if the link will work but if it does OP have a read! Might put things in perspective for you
You get the award for most patronising, unhelpful post.
By the same logic, if I break a leg, I'm not allowed complain because some people need walking sticks to walk, while they're not allowed complain as some people are in wheelchairs, while they're not allowed complain as some people are quadraplegic, while they're not allowed complain because some people are dead.
The op is feeling a bit unappreciated and is also missing her mum. These are perfectly valid feelings. What is hurtful is the fact that the kids were offered money to go to the shop but cba, thought about doing something with lego but then didn't bother.
OP - most teens are inherently selfish. In most cases, they grow out of it eventually. I suspect your feelings have a lot to do with the fact you have a lot on your plate with dh and a dc with sn, plus missing your mum.
I would suggest talking to your dc. Tell them mother's day is important to you and you'd like them to spend some time with you and that it's not about a present or card but about them showing you they love and appreciate you. Then ask them what they would like to do with you today, in addition to lunch.