I have booked flights for my family/my partner/my friends. Can miles be credited to my account that are flown by my travel companions?

No. Every single passenger can earn miles. For this reason the bluemiles card is restricted to a particular person. Therefore award miles for flights flown by travel companions cannot be credited to you. The same applies to children travelling with you. Please recommend your co-travellers to register for bluemiles so that they can earn miles and enjoy the advantages associated with bluemiles as well.