Formal:
* Lola: This is the most common and general term for grandmother.
* Lolo: This is the most common and general term for grandfather.
Informal:
* Nanay: This is a term used for "mother," but can also be used for grandmother, especially if the grandmother is very close to the speaker.
* Tatay: This is a term used for "father," but can also be used for grandfather, especially if the grandfather is very close to the speaker.
Other terms:
* Inang: This is a more formal and respectful term for "mother," and can be used for grandmother in some contexts.
* Amang: This is a more formal and respectful term for "father," and can be used for grandfather in some contexts.
Note: It's important to be aware of the context and the relationship between the speaker and the grandmother when choosing a term. For example, you would use "Lola" when addressing a grandmother you are not close to, but you might use "Nanay" when addressing a grandmother you are very close to.