Old Enough For The Truth

A couple with two children return to their holiday home after spending the day at a theme park. The stepmother, Laura, and the stepfather, Eric, go off to prepare dinner while leaving their stepchildren, Jordan and Oliver, alone. The step siblings are grateful for the fantastic vacation but harbor suspicions that their step-parents may have ulterior motives.
After the family finishes their meal, Laura and Eric continue to lavish attention on Jordan and Oliver, prompting the step-siblings to question their intentions. The step-parents become apprehensive but eventually confess to a shocking secret - they are actually step-siblings themselves. Laura and Eric admit to having a forbidden romance when they were younger, which led to them being ostracized by their family.
Despite trying to move on and marrying other people, Laura and Eric couldn't deny their love for each other and eventually reunited. Jordan and Oliver are taken aback and revolted by the news. However, Laura and Eric insist that their feelings are sincere and propose an intimate family gathering involving all four of them.