
The Abo and typing she is talking about are requirements necessary for a successful blood transfusion. It is preferable that both of those match for compatibility but there are alternatives if that's not the case, having those two requirements perfectly match is rare that's why they mention being fated to be together.
Same with transplants, just because they are family does not mean they will always be compatible, they have a higher chance but not always

These is some info, the first site is about the blood typing
https://www.healthline.com/health/blood-typing-and-crossmatching
https://www.rch.org.au/bloodtrans/about_blood_products/Blood_Groups_and_Compatibilities/

It's been 37 chapters.... Is it bad that her height has now started to annoy me?
Like if only she was at shoulder height with him at least! I love the story but because there is already so many other comedic antics to it her height ruins the whole dynamic for me now

It's been 37 chapters and her height is only just starting NOT to annoy me any more!
I thought about it a lot early on, and I don't have a problem with her being short, as such, I think it's that a lot of the time she's drawn more like a cartoon character compared to how everyone around her is drawn, and her height (or lack of) feels part of this unnatural-ness. It's like looking at a real person dating Hello Kitty or something...
But I still love this manga anyway.

Honestly speaking, Ookami and Kota are TOO GOOD for Kako imho but we got to know Kako as she became a couple with Kota so I have no qualms about them too, just wish they will put in a new possible love mate for Ookami...
I totally get that Ookami changed for the better because of Kako and she's the catalyst for turning points in a lot of the characters' lives an all but did the author really have to make her so emotionally involved in EVERYTHING but useless in Anything else??
Honestly Yui throwing those truths at Kako was sooo refreshing... I don't hate Kako, I hate how her character development have been set up
Kota has the right to go through the wave of emotions, it's the first time he's seen that guy after the incident and Kako goes and tells him he should see the best in him trying to do better for himself and she want to continue being around the guy who brought a tragedy to her husband's life
She's wondering if she missed something from the book?
She is taking into consideration that sh E just entered the story?
Now????