If my mom gives me money to buy her a ticket for the Texas Lottery?
I dont think so. It doesnt matter who bought the ticket it matters who turns it in and claims the money. My dad bought a scratch off and gave it to me, it was a big winner $20,000. I got the money. Plus your ex cant prove you bought it unless you tell him, even if he sees you but the ticket he cant prove it that ticket and some other ticket.