Talk about future plans- You can discuss your future plans with your new family as a part of the first day conversations. Plans of buying a new house, big car, investments and family holidays will impress them a lot, as they would be convinced that you are a visionary.
For males, it will surely gonna help you to impress your lady love's family members.
It will portray your ambitious side and will attract a lot of praise from the elder members who will realise that the future of their daughter is in safe hands.