Tullia was the daughter of the great Roman politician Cicero. She had a few marriages and according to English Wikipedia she had two sons, the first one of which died the same year it was born. Tullia gave birth to the second son in 45 BC, who survived. The English Wikipedia doesn't say anything more about that.
Do we know anything more about her second son (name, what happened etc)? Since Cicero lived two years longer than Tullia, one would assume that Cicero would have said something about the grandson in his letters, but that's maybe a longshot.