The sentence is grammatically and contextually correct. This is because, the verb, ‘to look forward to’ means toanticipate. It requires a direct object and it will be the gerund form of the verb i.e. ‘meeting’. Thus, the correct formation would be, ‘My brother is looking forward to meeting his employer tomorrow’.
The more interesting’ needs to be replaced with ‘the most interesting’. This is because, when making comparison between two or more things, the superlative degree is used and not the comparative degree Thus, the correct formation would be, ‘This book is the most interesting of the three’.