chances of havin twins

just wondering what my chances of having twins in my next pregnancy would be as my grandad is one of 3sets of twins in his brothers and sisters(unfortunately one out of each set didnt survive) but my mum and auntie didnt have twins and only me and my sister have had children so far and in dreading the thought of having twins(financially)


so if anyone could tell me what my chances of twins could be....please (cause there are also twins in partners family)
Thanks....x


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