inception, tenet and interstellar are connected : the theory, a thread (includes tenet and inception spoilers)

let's start with the first connection, Inception-Tenet.
I have reasons to believe Neil and Barbara are Cobb's son and daughter.
First of all the casting choice for these roles, both Rob and Clèmence resemble Cobb's son and daughter :

to strengthen this theory we can say that :
- Clèmence is 37 years old and Robert Pattinson is 34 years old, meaning they could actually be related in the movie since we can clearly see some age difference between the kids in inception

- Pattinson has dyed his hair specifically for this role, the casting sheet specifically asked for "light-brown hair"

- Clémence Poésy being French helps the theory, as we know Mal in Inception was played by french actress Marion Cotillard, giving more meaning to the choice of a french actress

The connection between Tenet and Interstellar is actually pretty simple. As we know Tenet's main mission was stopping Sator from exploding the "Time Bomb". The said Time Bomb was created in a distant future because the future Earth was at its limit.

This was done because, if the Time Bomb exploded, people from the future could have gotten back in time to take control of the past Earth and therefore stopping it from going to its limit. As we know the team manages to stop the time bomb.

Meaning the future Earth is still at its limit, remember something? It's the plot of Interstellar. In Interstellar we see an uninhabitable Earth.

Ending this saying that this is just speculation, nothing is confirmed, it's just making some connections, if you have something to add feel free to comment.