Rubisel Ichtaca and Linda Scott

If I were playing Rubisel I wouldn't force him to be with Linda because I don't care for EA created back stories or drama. He has probably never even met Linda prior to you starting a save and the child is probably the result of pollination (or whatever method EA sim creators use to impregnate sims for world setup). Since she is already married and as Rubisel isn't interested in the child, break-up would be your best option if you want him to go forward with a new relationship without the drama of a love interest hanging over him.