Ther or Their: How To spell?
The word Ther is misspelled against Their, a pronoun meaning "The possessive case of the personal pronoun they; as, their houses; their country."
Word contains consecutive vowels 'EI' in between alphabets th & r is misspelled as 'E' as letter 'I' is phonetically ignoredWrong Spelling:  th-e-r  Correct Spelling:  th-ei-r 
Explore spell check of Their to spell without errors.