This is difficult to answer because the main deciding factor is the judge in the case. If the spouse is a good parent (I realize many of us don't consider a cheating partner being a good parent though it has little impact if the child is protected properly), it is unlikely the judge will award sole custody to the faithful party.
Also, keep in mind that in most jurisdictions you will need to file for divorce. Custody will be determined as part of the divorce proceeding and having an extramarital affair is generally not a reason for denying custody.
When married you have equal rights to the child.
no
Yes
most likely he will lose his rights til the judge decides what is best for the child.
It is possible for any family to lose custody of a child if the child is not well taken care of.
yes, it can yes, it can Depending on the state you live in, in Michigan cohabitation is illegal so if one spouse is living with another person and not married to that person they can lose custody.
As in taking the child away from the other parent? Perhaps
yes.
If she is found to be unfit or addicted to drugs she could lose custody. Additionally, if she refuses to give the father visitation the judge could find her in contempt and change custody to the father.
Yes. This has happened to my cousin.
That would depend on the types and frequency.
Yes. Leaving children unsupervised is considered child endangerment regardless of who has "full custody". That could lead to the parent being deemed unfit and they could lose custody. See related question.Yes. Leaving children unsupervised is considered child endangerment regardless of who has "full custody". That could lead to the parent being deemed unfit and they could lose custody. See related question.Yes. Leaving children unsupervised is considered child endangerment regardless of who has "full custody". That could lead to the parent being deemed unfit and they could lose custody. See related question.Yes. Leaving children unsupervised is considered child endangerment regardless of who has "full custody". That could lead to the parent being deemed unfit and they could lose custody. See related question.