Is Olivia Newton John and Elton John brother and sister?

Related questions

1. When did Elton John change his name?
2. How did Elton John get his stage name?
3. What happened to Olivia Newton John's boyfriend Patrick?
4. Has Elton John legally changed his name?

Tags

1. #rumour
2. #newton
3. #related
4. #brother
5. #singers
6. #elton
7. #title
8. #england
9. #though
10. #track
11. #album
12. #sister
13. #write
14. #however
15. #months
16. #olivia
17. #apart