Relationships are about supporting one another's passion whether the other's passion is something we like or not.
I am married to someone who was cared of snakes and did not want one in his house however he knew that it was what would make me happy and therefore he supported that. He again supported me when I chose to get into breeding because again we believe in supporting one another.
Of course all that is based on the fact that we are financially stable and that at no point either one of our choices has ever been a financial burden.
So it's not about convincing someone it's about understanding the principal of being in a relationship and what it means.