married Sarah (unknown - 1815) in an unknown year. Known children:

1. John Heath - Baptised 1770. Died 1844, aged 73 years.
   
2. Mary Heath - Baptised 1772.
3. Robert Heath - Baptised 1774. Died 1788, aged 13 years.
   
4. Sarah Heath - Baptised 1776.
   
5. Lizzy Heath - Baptised 1779.
6. William Heath - Baptised 1785, aged 3 weeks. Died 1858.
   

All of the children were baptised at Wherwell in Hampshire.

Robert died in 1787 and was buried at Wherwell. Robert junior died the following year. Sarah died in 1815 aged 69 years. Both Sarah and Robert junior were buried at Wherwell.

It seems as though John, as well as William, moved to Halling in Kent - although I don't know when exactly. John's first wife, Margaret, was buried at Halling in 1821 aged 59 years old. John went on to marry for a second time, to Jane Aingell, at Halling in 1822. William and his wife Elizabeth were witnesses to this marriage. John died at Halling in 1844 aged 73 years. His wife, Jane, had died in 1838 aged 70 years.

married (1) Elizabeth (unknown - 1831) in an unknown year. Known children:

1. Margaret Heath - Baptised at Halling, Kent, 1808. Married Joseph Strong in 1825. Died 1885.
   
2. Sarah Heath - Baptised at Wouldham, Kent, 1810.
   
3. Eliza Heath - Baptised at Wouldham, 1812.
4. Hannah Heath - Baptised at Halling, 1814.
   
5. Elizabeth Weston Heath - Baptised at Halling, 1817.
6. John Heath - Baptised at Halling, 1819. Died 1846 aged 26 years. Buried at Halling.
   
7. William Heath - Baptised at Halling, 1821.
8. Thomas Heath - Baptised at Halling, 1824. Died 1870 aged 46 years. Buried at Halling.
   

married (2) Sarah (unknown - 1868) in an unknown year. Known children:

1. Alfred Heath - Baptised 1834. Died 1836.
   
2. Harriet Heath - Baptised 1836.
   

To date I haven't been able to find any trace of a marriage for William and Elizabeth, or for William's subsequent marriage to Sarah.

Elizabeth died in 1831 aged 47 years old. She was buried at Halling.

Alfred and Harriet were baptised at Halling, Alfred was also buried there, aged 1 year.

William and Elizabeth's daughter Sarah had an illegitimate son, George Heath, who was baptised at Halling in 1836.

The 1841 census shows William, Sarah, Thomas and Harriet living with William's grandchildren George Strong, Eliza Harris and William Harris. The 1851 census shows that William was an agricultural labourer. He was living with his wife Sarah, daughter Harriet  and two grandsons George Strong and William Harris. William and Eliza Harris were the children of William's daughter Eliza.

William died in 1858, and was buried at Halling.