Do most people in the same family have the same blood type/s?

While a child could have the same blood type as one of his/her parents, it doesn’t always happen that way. For example, parents with AB and O blood types can either have children with blood type A or blood type B. These two types are definitely different than parents’ blood types!

But two O parents, for example, will pretty much always have O kids. They will match both parents.

As you can see, sometimes kids’ blood types match and sometimes they don’t. There are certain genetics “rules” that allowed me to get to this answer, which I break down for you below. But like any good rules, there are exceptions.

See the links at the bottom on this page to previous answers that discuss some of these rule-breaker situations. Keep in mind though that they are very rare. Almost all cases follow a set of genetics rules based on how genes are passed down from parent to child. See genetics.thetech.org [/] ask-a-geneticist/parent-children-different-blood-type

Kind of, my all siblings have same blood type

Blood types are passed genetically but like with all genetics, nothing is certain usually. But odds are your family will always be your best match for things

Well, each will have the same blood type as one of the parents. So, in a large family there will be several with the same type.