Although loam is a combination of sand, silt and clay, adding sand to your clay soil, or vice versa, will not create loam. Doing so will result in something like cement.
According to Merriam-Webster, family values are values especially of a traditional or conservative kind which are held to promote the sound functioning of the family and to strengthen the fabric of society.
FAMILISM refers to core values of a family type which emphasizes commitment to the family as a unit. Staying together for the sake of the children would be an indication of this familism value.