The most appropriate indirect form of the given sentence is:

Albert said to Tim that he was not sure his father would consider it a good idea to have him on the board of his company.

The other answer choices are incorrect for the following reasons:

• Albert said to Tim that I’m not sure your father would consider it a good idea to have me on the board of his company. - This is incorrect because the pronoun "I" in the reported speech refers to the speaker, which is Albert.
• Albert said to Tim that he was not sure his father would consider it a good idea to have me on the board of his company. - This is incorrect because the pronoun "me" in the reported speech refers to the speaker, but Albert is talking about himself.
• Albert said to Tim that he is not sure your father will consider it a good idea to have him on the board of his company. - This is incorrect because the verb "is" in the reported speech is in the present tense, but the reporting verb "said" is in the past tense.