I recommend disconnecting Iulus from his parents.
Iulus is the legendary ancestor of the family of Julius Caesar (the Gens Iulia). According to the story Iulius was descended from the kings of Troy. The story appears in three different versions:
1. According to Vergil, Iulus was the same person as Ascanius, King of Alba Longa.
2. According to Livy, Iulus was the half-brother of Ascanius, the son of Aeneas by his Trojan wife, Creüsa.
3. According to Dionysius of Halicarnassus, Iulus was the son of Ascanius.
We don't know which version the family themselves believed but we do know Julius Caesar boasted about his descent from the goddess Venus. The Julio-Claudian dynasty honored her as Venus Genetrix ("Mother Venus") based on the legend the goddess fell in love with the mortal Anchises, and was mother by him of Aeneas.
There was a fashion in late Republican Rome for patrician families to claim descent from one of the gods, so the story is not unusual. Most modern scholars believe this is when the family of Julius Caesar invented the story that their ancestor Iulius 1000 years earlier was somehow connected to Aeneas' son Ascanius.
See, for example, T. P. Wiseman, "Legendary Genealogies in Late-Republican Rome" in Greece & Rome, Vol. 21, No. 2 (Oct., 1974), pp. 153-164 (Cambridge Univ. Press).
There are also chronological problems with the supposed relationship between Iulus and Ascanius. On Geni these are currently reflected by a 500 year gap between Iulus and his parents.
Finally, there is the problem on Geni that the line through Iulus is the most common path for users to be descended from the ancient Greek gods. Cutting this connection will re-route those connections through an equally fake British line. We'll have to deal with that one separately.
