This is a traditional Spanish decoration style.
I'm sad that a season's coming to an end.
I'm sad that a season's passing.
I'm sad when a season's coming to an end.
Adults give money to children among family members.
domdom This is a traditional Spanish decoration style. OK. Also: This is a traditional decoration in Spanish style.
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domdomThis is a traditional Spanish decoration style.
OK. Also:
This is a traditional decoration in Spanish style.
This is a decoration in traditional Spanish style.
domdomI'm sad that a season's coming to an end.
OK. Also:
I'm sad that the season's coming to an end.
I'm sad that the season is
The adjective "right" used attributively for "correct" in the context of your subject line, "Are these right sentences?", sounds odd. Use "correct".