Well, to determine if it's a manga, we need to look at factors like the style of illustration, the way the story is presented visually, and whether it originated from a manga culture. If these aspects match the norms of manga, then yes, it can be classified as such.
It's not a straightforward yes or no. 'Become a Family' might be a manga if it adheres to the conventions of manga creation and presentation. This includes aspects like the drawing style, panel layout, and the way characters and plot are depicted.
It depends. If it has the typical elements and format of a manga, like sequential art and a story told through panels, then it could be considered one.