• ileaster family,
• kleaster family,
• lleaster family,
• pleaster family,
• 0leaster family,
• 9leaster family,
• okeaster family,
• opeaster family,
• ooeaster family,
• olwaster family,
• olsaster family,
• oldaster family,
• olraster family,
• ol4aster family,
• ol3aster family,
• olezster family,
• olesster family,
• olewster family,
• oleqster family,
• oleaater family

The adjective form of "Oleaster Family" is "oleaster-family".

The plural form of "Oleaster Family" is "Oleaster Families".

The singular form of the word "Oleaster Family" is "Oleaster Family" itself. "Oleaster Family" is already a singular noun referring to a specific family of plants, so there is no need for a different singular form.