WHO TO PAIR WITH CASSANDRA AND WHY?

i always pair don with Cassandra. However, pleasantview is fun in the sense that don likes nina, dina and cassandra. with Don, i had him have kids with Cassandra, Dina, and Nina. Dina married mortimer, and last i played they expected a baby together, and had one. Nina also married and has kids plus a dog! Finally Cassandra married don, although they went on vacation together and they got mad at each other because don kissed dina. i saved my game as they repaired the relationship thank goodness.