If you didn’t already know these “Romance Languages” all evolved from Latin, it would be very difficult to spot.
First, Latin is the common ancestor of many of Europe’s most spoken languages. Yet virtually none of these languages share its inflections, its cases, its three genders, and so on. And on top of that, despite developing in geographic proximity to one another, these descendent languages are extremely dissimilar to one another (not only in grammar and spelling but also pronunciation). If you didn’t already know these “Romance Languages” all evolved from Latin, it would be very difficult to spot. For instance, the English sentence the beautiful birds sing in the gardens, is translated as follows to other languages. Notice how different they are from one another.