How can I stop my wife talking and meeting to her cousins and family friends in my absence

Is there a particular reason why you don't want her to talk or meet with her family without you?

Your wife is not a possession,she has wants and needs apart from you.

Are you jealous of her relationship with her family,do you feel the need to control the situation?

Are you the cause of your wife feeling unhappy?

So you want to know how to control your wife? You realize what you are talking about is a form of abuse, right?

Why don't you want her to meet her own family? Whatever the reason may be, but it just sounds very OFF!
Or if you can explain it further what's the reason for it.

Meeting cousins and family friends sounds pretty innocent to me. In fact it sounds like she has good relationships with her relatives.

So what is missing in your story? Are you insecure because she gets out and meets people she knows and cares about? What does she talk about when she is with them? What do they tell her?

If you are insecure, why? Has she done anything to you that merits those feelings? What have you done to her? Are you one who like to say where she goes and who she sees and what she does?
If so, is that kind of male behavior commmon where you live - culture, religion, etc.

Are you free to go and talk to your cousins and family members all alone? What do you say to them when you are with them? Do you talk about your wife? If so, what do you say? What do your family members say about your wife?

It is not unusual for women to gather to together. I suspect that women will often bond significantly faster then men. They can take a fast-path to those things called feelings and emotions.

Besides, they are probably only discussing personal things that would embarrass you anyway.

Let it go!

Why would you even want to. Is she not allowed a life apart from you?

Sounds you are a control husband. You are trying to keep your wife away from her family, this is abuse behavior.

how can I stop my wife talking and meeting to her cousins and family friends in my absence

You can't, and why should you?