My partner is suuuuuuper welcomed in my family & loved & cherished. My grand-mother even calls my girlfriend her grand-daughter. She is always included in family plans. My partner's parents are quite different. My gf's dad specifically has an extremely toxic way of being with my gf in my opinion. He literally would kiss the ground she walks on. He worships her so much. He praises everything she does. She will play like a card game and will HAVE to say how smart she is, like even if it's a luck card game or smtg. It's to a point where my gf's mom feels uncomfortable sometimes bc she feels excluded of their family trio. The other day I was saying how much my gf means to me that if we have kids I would be willing to carry her baby like with her eggs (we're 2 girls), bc that's how much I love her. Her dad stepped in and said "if I could I would too!" He acts as if we're in a competition or something which is fucking weird to me. We've been together for 5 years and her mom treats me well and is interested as me in a person for more than like just me being my partner's girlfriend, but the dad, NEVER, he "likes" me because I make my partner happy, and he shows zero interest towards me & I really try. He doesn't want my gf to share things with me he's like "it's HERS", like whether he bought her chocolate milk or tickets to a show or wtv he never says anything is for US, always just her. He doesn't want me to hang out with them unless it's like my gf's both parents, but like for instance my partner and him tomorrow are going to my fav restaurant and my partner asked if I could join, (they always have father-daughter time, alwaysss) & she wanted me to join because I love the restaurant and he said no. It makes me sad and idk what to do because i've made so much effort, and have showed love and care towards all of them. I am always so polite and interested in them. I feel so unloved by him and it makes me sad bc in my family my gf is soooo cherished. Oh and once I was joking and even said "you're so lucky to have me as your DIL" he said "hahah, no not really".. These are just a handful of examples but there's so much more. He never values me or my opinion or wtv. What can I do? (My gf 10000% agrees with me and it makes her sad how her dad acts and she also wishes it was different and she also doesn't know what to do)

PS: he's not like that with my partner's best friend, she's super 'educated' with lots of university degrees, so he loves how smart she is and therefore LOVES her and always asks about her. I stopped after a uni certificate to start my business and therefore i'm not smart enough for him.