Well, heres the small data which I have managed to gather…
There are not nearly enough samples to determine precisely the genetic makeup of the current population of Romania, since it is so genetically diverse.
Do we and Slavs share some genes?
Sure.
Are we Slavs?
No.
And that is because Romanians also share all the major haplogroups, in general Eastern Europe is more diverse than the West.
Here are some maps which I’ve downloaded:
As you can see, Romanians share genes with almost All of Europe and Beyond, we are quite diverse genetically.
So, again, are Slavs relatives?
Sure. We do have R1a, but it’s not that dominant, compared to Russia or Ukraine, for example.
Plus, all the Slavic countries, whether Eastern or Western or Southern Slavs, they all mixed with the local ancient/pre-Slavic tribes and formed new ethnic groups. Slavs are quite diverse actually.
Look at Poland, lots of R1b (compared to other Eastern Slavic Countries), for example.
We share things in common, but we are not (exactly) the same.
All Europeans share things, from genes, to cultural stuff, to religion, yet, each European population has kind of a unique (ad)mixture of things.
This is my view, of course.
All other views are OK.
Now, for the language part…
Using modern letters, I will add a text, from an older Romanian document, from 1521 A.D., since the script was Slavonic centuries ago:
" I pak să știi domniia-ta că au venit un om de la Nicopoe (= [Nicopole]) de mie mi-au spus că au văzut cu ochii lui că au trecut ceale corăbii ce știi și domniia-ta pre Dunăre în sus.
I pak să știi că bagă den toate orașele câte 50 de oamini să fie în ajutor în corăbii"
I can understand the text and it’s quite close to modern Romanian, yet has a few words which I didn’t know, until I read about them.
The language is clearly Latin based, well, that is the opinion of linguists throughout Europe and Beyond.
It had (we still use some of those words) lots of borrowed words from Slavonic, from Hungarian, and less from Turkish, Greek or German, among them.
In the XIX th Century it borrowed A LOT from French.
Also, the Capital, Bucharest, came to be called “Le Petite Paris” (the small Paris).
Borrowing from other languages it’s not unique, especially from French, which was the Biggest European language back then (before English overtook it in mainland Europe).
Nowadays, we borrow a lot of English words.
To get to the basics, we borrowed many words from the Slavs, in the past, but the core of our language, was/is Latin based.
Anyway, that’s enough replying for today.