there will be some sort of relationships, but the extent is still up in the air (it would seem):
Regarding character relations, will there be kids?
“We want your settlers to have relationships: to fall in love, mourn each other when they die, etc. Kids are tough. We’re not sure how to model kids moving from infant through childhood to adulthood. Maybe we can do something simple like have an infant to pow instantly “levels up” to a little kid then bam later becomes a full grown adult. We’ll keep thinking about it.”