What are the probability of have twins if..?

what are the chances of have twins if you're partner's mom is a twin herself??What are the probability of have twins if..?
It's not above normal I ponder. It should be coming from your side.
(I mean girl's side, I thought you r a girl!)
The information for twins differ widely, and depend on multiple factors. A secure figure <i>as an AVERAGE only</i> is just about 1-3%.
On the MATERNAL side, a history of twins is significant, as it raises the prospect of a repeat. This is believed to due to the woman possibly having a genetic predisposition to hyperovulation (releasing more than one egg contained by some monthly cycles). If more than one egg is released, more than one egg can get fertilized, producing... twins!
Note that this solely applies if the twins are fraternal (i.e. not identical). The process of making identical twins is completely different to making fraternal twins, and at hand is NO increased risk of identical twins inveterate. [The odds are roughly speaking 1:285]
The jury's still out on the risk if you have twins on the PATERNAL side - some studies suggest a mildly increased risk, others show no difference. Whatever the truth, any increased risk will be amazingly small.