I speak romanian and french, but I'm not a linguist.
Maybe this link could help you:
https://en.wikipedia.org/wiki/Romanian_language
...the differentiation degree of languages in comparison to their inheritance language (in the case of Romance languages to Latin comparing phonology, inflection, discourse, syntax, vocabulary, and intonation) revealed the following percentages (the higher the percentage, the greater the distance from Latin):[58]
Sardinian: 8%;
Italian: 12%;
Spanish: 20%;
Romanian: 23.5%;
Occitan: 25%;
Portuguese: 31%;
French: 44%.
The lexical similarity of Romanian with Italian has been estimated at 77%, followed by French at 75%, Sardinian 74%, Catalan 73%, Spanish 71%, Portuguese, and Rhaeto-Romance at 72%.
http://en.wikipedia.org/wiki/French_language
See: Grammar and vocabulary
French grammar shares several notable features with most other Romance languages, including:
the loss of Latin's declensions
only two grammatical genders
the development of grammatical articles from Latin demonstratives
new tenses formed from auxiliaries