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How do I determine when has, had or have is used in a sentece?

For example:
1. Uncle Joe and his family has decided to stay at our house during the December holiday.
2. Uncle Joe and his family had decided to stay at our house during the December holiday.
3. Uncle Joe and his family have decided to stay at our house during the December holiday.

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How do I determine when has, had or have is used in a sentence?

For example:
1. Uncle Joe and his family has decided to stay at our house during the December holiday.
2. Uncle Joe and his family had decided to stay at our house during the December holiday.
3. Uncle Joe and his family have decided to stay at our house during the December holiday.
1. Uncle Joe and his family have decided to stay at our house during the December holiday.-- 3rd person plural subject ( 'Uncle Joe and his family' = they)

2. Uncle Joe and his family had decided to stay at our house during the December holiday [when the typhoon suddenly struck and they stayed home instead].-- Past perfect requires reference to another succeeding past event.

3. Uncle Joe and his family have decided to stay at our house during the December holiday.-- OK

4. Uncle Joe has decided to stay at our house during the December holiday.-- Third person singular present tense.