Yeah, the question is "Does Marv-Ell of the Kree even exist at all in the MCU"? As for offspring? They can make them separate characters from Marv if they want.
For the ten thousandth time... Have we not learned that there is no guarantee that these characters will be one for one analogs of their comic book counterparts? It's like with Flash in HOMECOMING. Some are incensed that the HC Flash is not like the comics and therefore we won't get to the point in the films where "Agent Venom" is a possibility... Let's table the idea that an Agent Venom film would ever get made in a way that would encompass the decades long continuity that led to that story or that it could be done in an in depth way at all given that we get at best a film every two to three years with these characters with sub 2hr 15 run times for the most part... Why have the expectations at this point seeing all we have seen with these adaptations that you were as a fan ever guaranteed Flash Thompson as Agent Venom in the first place? Do you think a tertiary character and concept like that, being realized in live action, is what these films are about? They've altered the story of everyone from Cap to Hulk in these films. How was it Agent Venom was going to get a pass?
Same with the offspring of Marv. We could get them as the sons and daughters of "Marv-Ell, the Protector Of The Universe" or they could be substantially altered to fit as the creators see it more easily into the near ten year old MCU.
I am congenitally a "stick to the comics" guy but that's leavened by knowing that's not only not possible as often as I would like, but given the decades worth of stories in their exactitude that would have to be integrated to make the films line up not probable given the reality of film making.
