Okay so I know that it's up to the dad to carry the sex of the baby and it's up to the mom if you have multiple. My question is what side of the family does it need to run on in my family to determine if I will or could have twins? Twins run in my dads side but I'm not 100% sure if it does on my moms side. It also runs in my husbands side of the family. Tips and tricks to get pregnant with multiple that are natural not <a href="https://glowing.com/glow-fertility-program">IVF</a>.