If you are having family or couple photos, one way of showing that you are a cohesive group is by having coordination in what you wear.
In order for your photos remain timeless, I suggest you avoid wearing current trends and stick to classics.
It can feel too hard to work out a cohesive look and the default may be to tend towards all wearing the very same outfit.
I want you to have more freedom. Use the color pallette ideas in this album as inspiration of how a range of colors can 'work together' and show your family's linked-ness without making you clones. :)