No. He is supposed to return for his seventh year but at the end of Half-Blood Prince he told Ron and Hermione he wouldn't return because he needed to destroy all the Horcruxes and kill Voldemort.
Voldemort takes control of the wizarding world and attendance at Hogwarts is made mandatory so that Voldemort and the Death Eaters can capture all muggle-borns and keep all under aged wizards under control. Out of the trio only Ron could go back to school without being killed - Hermione would have been sent to Azkaban because she 'stole magic' and Harry would have been handed to Voldemort. However they do end up at Hogwarts for the final battle.
Harry and Ron never went back for their seventh year but Hermione did.
No, Roxanne Weasley does not start Hogwarts in Harry Potter and the Deathly Hallows. Roxanne is not a character mentioned in the original Harry Potter series written by J.K. Rowling.
Her birth date is unknown and she is mentioned at the platform so we don't know. However, as her parents are older it is likely she is already at Hogwarts.
No, Fred was dead he couldn't return to Hogwarts.
in the deathly hallows at the battle of hogwarts
As of the epilogue in Deathly Hallows, only Fred had died. His death was caused by an explosion from an unconfirmed source during the Battle of Hogwarts. George is still alive, and married to Angelina Johnson, with two kids, Fred II and Roxanne Weasley.
Yes, Bellatrix Lestrange dies in Harry Potter and the Deathly Hallows. She is killed by Molly Weasley during the Battle of Hogwarts, because Bellatrix attacked Ginny.
Ron Weasley lived through the battle at Hogwarts, graduated, married Hermione, and went to work as an auror at the Ministry of Magic.
Molly Weasley kills Bellatrix Lestrange in a duel, when Bellatrix was attempting to finish of her daughter. This happens near the end of the Battle of Hogwarts, in Harry Potter and thhe Deathly Hallows.
Fred Weasley.
Since Fred died he could not marry anyone but seems that George married Angelina Johnson and had 2 kids Fred and Roxanne Weasley.
He dies
Ginny Weasley.
In Harry Potter and the Deathly Hallows, Bellatrix Lestrange turns her wand on Ginny Weasley during the Battle of Hogwarts, causing Molly Weasley to attack her while screaming the line, "NOT MY DAUGHTER, YOU B****!"
Ginny Weasley.