@ confused90, you can transfer your investment funds whichever way you like, the most important thing is to make sure that all the documents are well kept.
Usually transferring directly into your business account is the best and straightforward way but this is not the only way. Also get an accountant to prepare your director's loan documents once the funds is transferred into your business account as you might need it during visa renewal.
Your brother and parents cannot be your dependant on Tier 1 entrepreneur visa, only your wife/partner and your children can be your dependant on this visa.
But your brother and parents can apply as your general visitor and not even family visitor.
The key to success is knowledge and hardwork, and to have faith.