This is good advice OP.
But remember "Eaten Bread is soon forgotten."
A week after this, it will all be done and dusted. You don't have to listen to them all going on about it.
Realistically, if they are going to Wembley and have seated tickets, unless they have the best seats in the house.. they will hardly be able to see tiny Noel and Liam. Really they will be watching the giant video screens. They might have a better view of the stage standing, but that will be intense and very very packed and in my experience usually full of very tall men. The sound may/may not be great but that won't matter because it will be drowned out by everyone else singing. Yes it will be a great atmosphere but its only a few hours. I think people will enjoy it but are you really a long term die hard Oasis fan? It will mean more to them.
Its more FOMO..
It's probably too late to get tickets now, unless you pay through the nose and you wouldn't be with them anyway unless you all managed to get standing anyway which are at a premium I hear.
Also... Why not plan your own fun things to do and look forward to.. If you are a music fan there are small festivals which are billed as "family friendly" (google them). It can be a lot of fun, like a mini holiday.
Also. Noel and Liam will also continue doing solo gigs after the reunion tour and those will also be good. Can start saving and planning now for those?
Is there another artist you'd really like to see touring in the future - start saving and get on the pre-release ticket sales list and then you will have a fun concert to look forward to. Plan your own treats, even if you have to save or wait for them and you won't feel so much like you are missing out.
I'd focus now on finding some useful childcare sources for emergencies that may crop up or for things you want to do. Is there another mum with similar age children you are friends with, that you could have a babysitting swap with? Or that you could team up with to do fun days out with the children with? Those days were some of the most fun we ever had and I'll never forget them.
I'm sorry they didn't get you a ticket and that you feel left out, don't let the situation get you down, but take charge of it. In a few weeks it will all be in the past and you will hopefully have made some new and exciting plans for your own fun times.