Call yourself and have him give permission for you to talk. (Maybe he is not willing at all, but for that cash, I would be trying anything.)
I tried to get my son to apply and he sent me the emoji with the right eye monacle - the 'suspicious' one. He and his player 2 could easily have 228K UR's with their wedding expenses, a lot of which I'm funneling money for. He actually complained about the fee for using a card with the caterer, and I explained the cost, step by step. His response - we are going to write a check. Ugghhhhhhh! Before I gifted them money I should have thought about it and planned a strategy, but I did not.
Older daughter - all for it. But she has a CSR and an Amex plat that she won't be without for 5 minutes. Any other card, all in.
Younger daughter - been trying to find a 'good' opening to get her to do this. There's like a 10% chance.
So,
@Andysol - so many people just 'pay' and pay and pay. I'm sure CSP would approve all my family members - good incomes, over 800 credit scores just to get a few thousand spend over the course of a year, with the outside hope that someone would pay interest but make regular payments. Money left all over this table. Caterers for 3 events, the wedding event, all that goes with it. This actual spend could power a load of points. Instead, I booked Maui, Hawaii for them with my points. Not sorry - I give my kids what they want, but so many lost opportunities.