Siblings using the same spoon and cup at the same time

They are 3years and 1 year.

How old are they?

I don't think it matters too much if they are pre-school age

Sounds weird to me, but that’s her style of parenting and I wouldn’t comment. I’ve no idea how old they are but if they are old enough for you to take them out for a meal it would be interesting to see what happens.

I don't think you can, its her way and that's how she chooses to parent.
Maybe they eat better like that?

I honestly don’t think it matters. They’ll catch things from each other anyway is it really worth causing a argument?

How very strange is she trying to cut down on the washing up I wouldn’t worry about germs but are they Siamese twins if not they need ( in my opinion) to be treated as two separate children and each have their own equipment What about when they eat out or at a friends house
Unfortunately if that’s the way they want to do it not much you should or could do about it

How strange! Apart from the hygiene aspect, children need to learn how to conduct themselves when eating with others.