Yes having twins is hereditary. But having identical twins isn't.
hereditary
Yes particularly if your first set of twins are fraternal (aka non-identical twins) as these are the type of twins that are said to have a hereditary connection.
The fact that twins run in families is actually a myth. The odds of twins having twins is the same as a non-twin having twins. That is about 1 in 33.
fraternal twins
Oh yes it does! I never dreamt I would become pregnant with twins. There are no twins in my side of the family. None that I know of. However, at my baby shower, I found out from my boyfriend's family that there were at least 4 sets of twins in his family; his grandmother had twins, his grand aunt had 2 sets of twins and his cousin had twins. It's amazing how science doesn't know everything because my high school friend had fraternal twins and when she found out I was having identical twins she told me that that wasn't hereditary, but obviously it is after learning my boyfriend's family's history.
No, Britney Spears is not having twins.
Usually, having knack to play any instrument is hereditary.
I'm not sure on the actual percentages. It firstly depends on if your father is an identical or non-identical twin. (Maternal or fraternal) Non-identical (fraternal) twins are the hereditary type, not the identical ones. Identical twins are simply a hiccup with the cell division during fetal growth, whereas non-identical twins are due to the hereditary tendency of the woman releasing more than one egg at a time. The gene for non-identical twins is directly passed from fathers to daughters, and the chance of having twins usually skips a generation too (like baldness in men!). So, if your father is a twin (a non-identical twin) and you are his daughter, it's possible that you may also have twins, but it's far more likely that your daughter will. My father is a twin (his brother died at birth and it's not known if he was maternal or fraternal unfortunately) and I only have 1 child (a daughter). She has a very high chance of having twins if dad was fraternal.
No, but if you have twins in your family there is a good chance of twins but soy stuff does not increase or decrease your chance of having twins.
No, Kate and William are not having twins. The royal twins that were born were to Prince Albert and his wife, Charlene, of Monaco.
Yes, having low hcg levels or no hcg levels while pregnant can be hereditary
Having twins is based on probability. There is not a 100% chance you will have twins.