Sometimes, I crave unstructured time with the three little souls that began their lives with me. We know each other better than anyone and we share a wealth of history. We each value the time we share with just us, honoring the ties that began before our family blended. My husband and step daughters thank me over and over when I encourage them to go out on a "date" with just the three of them.
In the same way, continue the traditions and rituals that you began before your families blended. Some of these may be adopted by everyone, others may remain your own private personal privilege. Nighttime prayers, Sunday morning coffee, favorite restaurants, custom artwork drawn in toddlerhood and proudly displayed can all be incorporated into the blended home to honor and value to the original bonds.
Initiate new traditions that bridge the two families. Some things that work for us are birthday dinners, regular hikes to the mountains and a yearly vacation together. Even with all the schedule conflicts and possible stress of our large group, we make the effort to spend time together. We always gain a sweet return on the investment of time.