Bring pokermum out on a fine date (leave pokercub with granny?),
Buy her a nice piece of rock (if you can afford to,if not any special token will do)...
Clink your glasses..
And offer her your proposal. (Get down on one knee if you want to)
Get her to understand that you really want to do this and you need her full support as the mother and wife.
Cheers!!
Btw, well done poker family!