Did this for Devils Food Cake (Beel x Faith) , Fly Away With Me (Android 16 x Raine), Opposites Attract (Calla x Albedo), Soak and Shiock (Jade x Childe), and YuZhu (Yuming x Baizhu)!
Devils Food Cake: The entire plot of the Obey Me games is MC (Faith) meeting the demon brothers and dealing with all their family drama, so Faith's closer to Beel's family than she is her own- luisghsleiurhg I'm still trying to decide what Faith would end up doing about her own family, honestly...
Fly Away With Me: Raine... technically sees Android 16's 'father' Gero, and gets to know Androids 17 and 18 over time. Raine may not be super close to 17, but she and 18 get along fairly well! 16 has met Raine's family, and while her nibling Andi isn't phased by him in the slightest (they even helped with repairing him a little bit during the Cell Saga), the rest of her family was... very concerned. They were already worried about the kind of people she'd likely be dealing with as a tattoo artist, so for her to bring home an absolute giant of a man with a completely neutral resting expression and a bright red mohawk? There's a reason Raine does her best to keep her life with the Z-Warriors as much hidden from her family as possible-
Opposites Attract: (Keeping in mind I'm not caught up on current canon-) Albedo has met Calla's parents! They'd known of each other before having met with Albedo and Calla having any romantic interest in each other, but that didn't stop him from being concerned about 'first impressions' once Calla had explained to him why she wanted him to accompany her to Liyue for a trip outside of the holiday seasons. It ended up going wonderfully though, with her father Hao the most skeptical and quickly softening when seeing how clearly Albedo adored Calla. She found someone intelligent, honest, and kind. What more could he hope for? Calla also helps with Klee all the time, and was her unofficial big sister figure well before she and Albedo were dating. She hasn't met Rhinedotter and has... complicated feelings about the woman, so she's not in any particular rush to try and meet her.
Soak and Shock: I'm still very very slowly working on re-hashing Jade, but one idea that's stayed constant is Jade going to Snezhnaya with Childe to visit his family! She ends up getting along with them all impressively well, more than happy to help with wearing out the kids, even if the cold is wreaking havoc on her joints.
YuZhu: I feel like Baizhu would know of Yuming and her family before she came to work for him at Bubu Pharmacy, thanks to how often she'd had to visit the Pharmacy. However, it is thanks to knowing of them in that capacity first that Yuming ends up (rightfully) anxious about having him meet her parents. He's polite, of course, because he knows that her family is still very important to her despite everything. However he also takes every opportunity to praise Yuming and her knowledge of medicine, how capable she is, etc. He also makes minimal attempts at scolding Changsheng for her own sharp tongue.