MIL rejecting my son

Lyndsey
Tonight she said "he doesn't feel like my grandchild".... She said this because we asked her why she never comes to see him, or asks how he is. She's never given any effort when we have offered her more than once to come over and see our baby. He's now 3 months old.... And she's seen him 2 times. She lives literally down the street..... I'm so fed up. I don't want my son to be alienated from his grandma but my God what do I do? She has 4 other grandkids that she visits on a weekly basis. Goes out of her way to see them. I feel so sad for my baby boy....