I recently spoke to Dr. Julie McDonald, a colleague of mine who has extensive experience working with blended families. We made it into a podcast!
Blended families are the result of marriage, divorce, and remarriage, which both husband and wife bring children from the previous marriage to the new family. But much of what Dr. McDonald discusses also applies to "simple stepfamilies" in which only one member of the couple has children from a previous marriage.
We have many blended families at Prince of Peace. If you know some, consider sharing this with them!