Yes, they are the offspring of Tartarus and Gaia.
For locking up her children in Tartarus.
Yes Chaos did as she/he was the first Greek God. She had a few kids like Gaia and Tartarus and Nyx
Gaia didn't build it. After the Cyclopes where freed from Tartarus they created Mt. Olympus
He had no physical father, he was spawned from Gaia's union with Tartarus
Because Uranus Imprisonded Gaias Children into the deepest treches of Tartarus and this obviously caused pain to gaia
Typhoeus, also known as Typho, is the last son of Gaia and Tartarus.
You are probably thinking of Typhon. He was the son of Gaia and Tartarus, and was a monster.
Gaia, the mother of all titans.
Gaea was mad at Zeus for having locked the Titans in Tartarus. Gaia is the Greek Mother Goddess, and Terra is her Roman equivalent.
The revenge was because the OLYMPIAN GODS imprisoned Gaea's children, the Titans in the TARTARUS
In one form of Greek mythology, yes, Gaia has siblings: her future partner Ouranos, Tartarus, Nyx and Eros. In another form, no; she was the only being that emerged from Chaos.