Have lost contact with a relative.

[sweepo]

My uncle has, I think, recently moved and has not got in touch with his new address. My dad is very concerned as he can't get hold of his brother. Can anyone give me any advice on how to start looking for someone?

[sense4all]

Drop 'em a line they may be getting their post re-directed.

[JK2]

Maybe one of the neighbours near where he was living know his new address.

What about work? Can't your Dad ring the company his brother works for & speak to him?

[bednobs]

there might be a reason he hasnt got in touch. Presumably he knows where your dad lives, so its up to him