To address your questions:
1]I have a married daughter age 40+ and an unmarried son age 31.I have one surviving sister and one surviving brother.None of the above are economically dependent on me.
2]Normally I am careful never to stay longer than 90 days [including travel days.] This year I stayed for 118 days since my wife's sister has Motor Neurone Disease and we assisted with caring since she is still at home.[We were advised that under the revised rules of residency then we could stay for 120 days.]
3]I have not worked in the UK since 1983 and apart from our State Pensions and a very small frozen pension,which I declare as taxable income in the UK,I have no source of income there.