The most common version of the myth has their (maternal) grandfather as Numitor, and their great uncle would be his brother Amulius. I can't find any citations of Numitor's wife having any brothers (or even what her name was), but if they exist then they'd be great-uncles as well.
On the paternal side, their father was allegedly Mars, so their paternal grandfather would have been Mars' father Jupiter, with their great-uncles on that side being Jupiter's brothers Neptune and Pluto (and Jupiter himself, by virtue of being also the brother of his own wife ... and Mars' mother ... Juno).
the twins, Romulus and Remus who founded Rome, were the sons of the vestal virgin Rhea Silva and the god Mars.
Romulus killed Remus by tossing a stone on Remus
Romulus and remus
The father of Romulus and Remus was the god Mars. Rome was named after Romulus.The father of Romulus and Remus was the god Mars. Rome was named after Romulus.The father of Romulus and Remus was the god Mars. Rome was named after Romulus.The father of Romulus and Remus was the god Mars. Rome was named after Romulus.The father of Romulus and Remus was the god Mars. Rome was named after Romulus.The father of Romulus and Remus was the god Mars. Rome was named after Romulus.The father of Romulus and Remus was the god Mars. Rome was named after Romulus.The father of Romulus and Remus was the god Mars. Rome was named after Romulus.The father of Romulus and Remus was the god Mars. Rome was named after Romulus.
Romulus and Remus, twin brothers raised by a she wolf.
Their Uncle. Surprising Huh?!?!
Because he wanted all the power.
the twins, Romulus and Remus who founded Rome, were the sons of the vestal virgin Rhea Silva and the god Mars.
Romulus killed Remus by tossing a stone on Remus
Romulus and Remus did not have twins. They themselves were twin brothers.
Romulus and remus
The father of Romulus and Remus was the god Mars.
Romulus and Remus were the twin brothers who founded Rome.
The father of Romulus and Remus was the god Mars. Rome was named after Romulus.The father of Romulus and Remus was the god Mars. Rome was named after Romulus.The father of Romulus and Remus was the god Mars. Rome was named after Romulus.The father of Romulus and Remus was the god Mars. Rome was named after Romulus.The father of Romulus and Remus was the god Mars. Rome was named after Romulus.The father of Romulus and Remus was the god Mars. Rome was named after Romulus.The father of Romulus and Remus was the god Mars. Rome was named after Romulus.The father of Romulus and Remus was the god Mars. Rome was named after Romulus.The father of Romulus and Remus was the god Mars. Rome was named after Romulus.
Romulus and Remus.
Romulus and Remus, twin brothers raised by a she wolf.
Their mean jealous great uncle wanted to kill romulus and remus because he know he was in line to be king when his brother died but then he had two airs to the thrown so numitor got mad and planned for his nephews to die and planned for their death. He planned for someone to throw romulus and remus and their mother Rhea Silvia to be thrown into the Tiber River