Alex & Xander

The new Will that was found & the letter that Maggie & or Justin had read to learn that Alex is Victor’s son. The question that I have is that both Constantine & Theresa both know that Xander is Victor’s bio-son, if that’s true & that Xander is Viccy-boy’s son, & that Alex doesn’t have any money at all, then why have Constantine bring up for Alex to hear that Theresa is after his inheritance, that he doesn’t have & that Xander does, if they were the ones that created the illusion that Alex is Vic’s bio-son? To me, it’s like that Theresa has fallen for her own or their own hoax, given that they both know that Alex doesn’t have the money that she’s after, right?