I want british citizenship with my family, i am a...

Foreigners can apply for permanent residence in the UK after 5 years of legal residence in the UK In some cases the waiting time is less than five years and you can apply for British citizenship after 5 years of residency (In some cases less than five years) after your permanent 12-month stay in the UK.
You can apply for British citizenship by naturalization after 5 years of residence, or after 3 years of residence if you are married to a citizen of the United Kingdom or in a civil partnership with it that needs to meet the following British citizenship requirements:
- Adequate knowledge of English
- Pass a life test in the UK
- Do not have a serious criminal record
- You haven't spent more than 450 days outside the UK in the past five years (270 days in the last 3 years if your partner is a British citizen)
- Don't spent more than 90 days last year outside the UK
- Acquired permanent residence in the UK 12 months ago
As for making sure whether your husband is going to marry or not, we would like to assure you that British law prohibits polygamy, if he wants to marry and it is revealed through the restrictions that he is married, the marriage contract will not be concluded