There is a machlokes regarding when Yocheved married Elizaphan bar Panach who became the nasi of Shevet Zevulun. The issues that everyone has with How could she marry someone in between her remarrying Amram are valid.
So, Rashi in I believe Rosh Hashana, says that she married him after Amram passed away.
Da’as Zekainim miBa’alei Tosfos is quoted as saying that Amram divorced Yocheved (his aunt) after the halachos of incest were taught and that’s when Elizaphan married her.
There are also those who hold that Eldad and Meidad were neither brothers nor related to Moshe.