Family business name apostrophe 's or s'

My brother and I are setting up a painting and decorating business and there's a small dispute to where our apostrophe goes. Initially, I thought "Sheppards' Painting and Decorating Company" would be correct showing that Sheppard is plural with the two of us. But other people are saying it's just Sheppard's because it's the family name? please, someone put us out of our misery for good.

Many thanks,

Solution 1:

I think the correct one would be Sheppards' .

Sheppard's will be a single person's. Sheppards' will mean a family's or "of people named Shappard each".

Solution 2:

Firstly, it's your shingle. You two get to name it.

Secondly, you're correct. Two Sheppards own this business, so the plural possessive applies exactly as you thought.