I see a wedding as the joining of two families, a celebration of their love and commitment
Yes. The bride and groom are celebrating their love.
The groom doesn't consider his SILS children his family.
They don't have a relationship.
What your brother has done is cleave an axe through your family unit
Talk about dramatic. I would question how strong the family was if this breaks them.
I'm sure your DB would walk past your SC in the street because he doesn't really know them.
Steps and children should be treated equally in the home they reside. Expecting the rest of your family to do the same is unrealistic and it's expecting too much.
They have no obligation to see your SC as their family. Your DC were invited as your DBs niece/nephews.
It's about the relationship the Bride/Groom have with the guests... not relationship by extension.
They clearly wanted only those very close to them (hence Aunts and cousins) were not invited. I can see why they don't want teenagers who quite frankly are no relation to them at their intimate wedding. It's not a free for all wedding.