The answer to that, I think, is date night. Get a good reliable sitter and start having regular date nights. She needs the space to get away from child rearing. You need to woo her.
Yes! An escape from the children and enjoying romance and dates together could help dramatically. Pick things you both enjoy. Have fun, bonding times. Date days. Date nights. This is something concrete you could ask her father for help with. One warning--NO EXPECTATIONS. Most single people don't expect a dinner date to lead to sex, but some married people do. The moment you add those expectations, the moment you've completely undermined the point.
