I'm getting kind of jealous

The other day I went out with my MIL and she was telling me how close she is to her grandson and how she feels such a strong connection to him bc she's always had him. She's always had him bc the real mom is never there and is always handing out the kid to someone to watch him like if he was a bag of candy. She explained how much she loves him and how the baby is everything to her. She even buys the baby things all the time like if it were her own..Since she found out I was pregnant she doesn't get our baby anything, she'll tell us she excited for the baby to come, but I can't help but feel jealous when she doesn't show this much love by expressing it or buying my baby things. On the other hand my parents have gone over the moon crazy about being there and helping us with baby things. I know I'm probably wrong for thinking this..But idk what to do or how to feel...