If you like. You may want to investigate the ownership rights of the 'uninvolved' spouse, as well as the wisdom of forming a partnership with a married person.
If it's entirely business, all well and good. If there is also a romantic component then it is usually true that if they will cheat on their current spouse, they will cheat on their next spouse.
No, it is illegal to open someone else's mail, even if it is delivered to your house.
Not in america. But a minor may be legal somewhere else to get married.
It is pretty bad to be married to someone that has done that but for a punishment get engaged and no it is not legal to have a child if someone else is married.
Yes, someone else can purchase a house on your behalf through a legal process called a power of attorney, where you give someone the authority to act on your behalf in real estate transactions.
No, it is illegal to open mail that is addressed to someone else, even if it is delivered to your house.
Before someone can get married again they must have a finalized divorce decree from the first marriage. Without that the second marriage is not valid.
No, it is not legal to use someone else's license plates.
He married in another state and didn't know he was still legally married to someone else
If you were not married when the child arrived the legal custody lies with the mother. The father have to prove paternity in court before he can get his parental rights.
No, it is not legal to cash a check with someone else's name on it without their permission.
No, it is not legal to use someone else's credit card without their permission.
No, it is not legal to open someone else's mail that was sent to your address.