This shows Chu Yan-Kit and Cheung Yue Lan in what looks like a studio wedding shot. To Yue Lan's right the other adult female is her sister Yuk Lan.
Is anyone able to identify the other adult male and the children in the photograph? He might have been one of the two brother of Cheung Yue Lan and Cheung Yuk Lan as Chu Yan-Kit only had sisters.