Best vegan cheese/butter?

I’m very slowly making the transition to being vegan. I’ve tried multiple times but due to family pressures never stuck at it. However in the last few years I moved to a pescatarian diet, but still feel conflicted with that. We now use Planthood during the week and I have huel for breakfast and lunch and so I am mostly vegan because of it. Recently my husband felt conflicted with eating meat so he’s stopped that completely too.

I’m wanting to try to transition our family to being vegan, but am struggling to find decent dairy substitutes for my kid. He’s 3 and has refused to eat meat his whole life, but the kid loves cheese. I’ve tried him with violife which I personally love but he can tell the difference and won’t touch it. The same with butter for my husband- I don’t mind dairy free spreads but he’s not a big fan. Just wondered what was the best mature cheddar/ Red Leicester substitute and best butter substitutes people have found so that we can seamlessly transition to vegan as a family.

Many thanks!