These are ideal conditions though, and for some it's never been this way with certain family members. These relationships, when stressed or tense, are the worst to endure because our family means so much to us. Unfortunately, many people are faced with the excruciating decision of whether or not to continue a strained family relationship with a parent, sibling, grandparent, son, or daughter. If you have to cut the ties, it's usually because you feel you have endured years of discontent (or even abuse) and you have no other choice. Many who are reading this have endured too long.
Such systems generally assume that the mother's husband is also the biological father. In some families, a woman may have children with more than one man or a man may have children with more than one woman. The system refers to a child who shares only one parent with another child as a "half-brother" or "half-sister". For children who do not share biological or adoptive parents in common, English-speakers use the term "stepbrother" or "stepsister" to refer to their new relationship with each other when one of their biological parents marries one of the other child's biological parents. Any person (other than the biological parent of a child) who marries the parent of that child becomes the "stepparent" of the child, either the "stepmother" or "stepfather". The same terms generally apply to children adopted into a family as to children born into the family. In the United States, one in five mothers have children by different fathers; among mothers with two or more children the figure is higher, with 28% having children with at least two different men. Such families are more common among Blacks and Hispanics, and among the lower socioeconomic class.