While we don't have an exact list of entrants playing with family members, we do know that two brothers from France in Derek and Florian Decamps are both in the Day 1a field.
Florian has had a rough start and his stack is now down to half the starting size. In a recent hand with already 5,000 in the pot before the appeared on the flop, Florian checked the action to his opponent before calling a bet for 2,700.
Both players opted to check when the appeared on the turn. Meanwhile, when the appeared on the river, Florian tossed into the pot one 5,000 chip and declared a bet of 4,500. His opponent thought things over before calling. The pot shipped to Florian's opponent after he showed and his opponent exposed for middle pair and Florian's stack dropped to around 13,000.
Derek is faring a bit better on another table with a stack of 35,000.