1. It's about father's love to children.
2. It's about Father's love to children.
3. It's about Fathers' love to children.
4. It's about a father's love to children.
5. It's about the father's love to children.
(Which ones are grammatical?)
4 and 5 are best -- but "for" is a better preposition than "to."
number 4 looks like it's the right one
All the options you provided are grammatically correct, but they have slightly different meanings and usage:
1. "It's about father's love to children."
This sentence is grammatically correct but is not commonly used. It suggests that there is a single father who loves children in general.
2. "It's about Father's love to children."
This sentence is also grammatically correct, but the use of "Father" with a capital F suggests that it is referring to a specific or symbolic father figure, such as a religious or spiritual entity. For example, it could be about the love of God or a divine being for children.
3. "It's about Fathers' love to children."
This sentence is grammatically correct, and it implies that it is discussing the collective love of multiple fathers for children. This could refer to fathers in general or a specific group of fathers.
4. "It's about a father's love to children."
This sentence is grammatically correct and suggests that it is focusing on the love of one specific father towards children.
5. "It's about the father's love to children."
This sentence is also grammatically correct and implies that it is referring to a specific father. It suggests that it will discuss the love of a particular father for children.
The most common and generic way to express the idea of a father's love for children would be option 4, "It's about a father's love to children." However, the choice of which sentence to use would depend on the intended meaning and context of the statement.