Reid could use his profiling skills to understand the family dynamics better. He might analyze the behavior patterns of both families and find common ground. Lila would then use this information to create a harmonious environment. For instance, if both families love a certain type of food, they could have a dinner centered around it to break the ice.
They could also choose to create their own new family traditions that are separate from their original families. This way, they can start fresh and not be bogged down by old family differences. They would be building a new family unit based on their love and shared values.
They might start by having an open conversation. Reid, being logical, would lay out all the issues calmly. Lila, on the other hand, could use her charm to ease the tension. For example, if Reid's family is more reserved and Lila's is very outgoing, they could plan events that blend both styles.