Is it considered a sin to send a person who is negligent in prayer back home after the Maghrib Adhan, especially if he is tired, knowing that compelling him to go to the mosque might affect his devotion?

Congregational prayer is obligatory for those who are able, and it is not permissible to miss it except for a legitimate excuse. If a person is not sick, then it is obligatory to accompany him to the mosque, encourage him to pray in congregation, and guide him to its virtues. As for the matter of devotion and the acceptance of prayer, these are unseen matters, and what is required is to think well of Muslims. We advise you to gently invite him to maintain prayer, and if he does not respond, then there is no good in his companionship, and you should accompany the righteous and attend gatherings of knowledge.