Though their parents gave them all the support, they still failed in life.

The sentence "Though their parents gave them all the support, they still failed in life" consists of a subordinate clause ("Though their parents gave them all the support") followed by a main clause ("they still failed in life"). The subordinate clause begins with the subordinating conjunction "Though," indicating a contrast.

• The use of "Though" correctly introduces a concessive clause.
• The comma after the subordinate clause and before the main clause is correctly placed.
• Pronoun usage ("their," "them," "they") is consistent and refers to the same implied subjects.
• Verb tenses ("gave," "failed") are consistent (past simple).
• There are no apparent spelling errors.

The sentence is grammatically sound and correctly structured.

The sentence is:
Though their parents gave them all the support, they still failed in life.

This sentence is grammatically correct.