"The children are playing with their toys." Here, 'their' is-

• Pronoun ৯ প্রকার। যথা:

1. Personal pronoun (He, They).
2. Possessive pronoun (Their, Ours).
3. Reflexive pronoun and Emphatic pronoun (Myself, Ourselves).
4. Demonstrative pronoun (This, Those).
5. Indefinite pronoun (None, Several).
6. Relative pronoun (Which, Where).
7. Interrogative pronoun (Who, Whom).
8. Distributive pronoun (Each, Either).
9. Reciprocal pronoun (Each other, One another).

তাহলে, "The children are playing with their toys." Here, 'their' is- Possessive pronoun.

তবে, Possessive pronoun কে অনেকক্ষেত্রে Personal pronoun এর অন্তর্ভূক্ত ধরা হয়। সে হিসেবে Pronoun ৮ প্রকার।

Example Sentence:
1. My: This is my car.
2. Your: Is this your book?
3. His: That is his computer.
4. Her: I met her sister yesterday.
5. Yours: The decision is yours.
6. Mine: The keys are mine.

Here, My, Your, His, Her, Yours, Mine - Possessive pronoun.

Source:
1. Applied English Grammar and Composition by P C Das.
2. Advanced Learner’s Grammar & Composition by Chowdhury & Hossain.