Only love for the Supreme Lord is true Bhakti. Love for any other being, however great, is not Bhakti. The "Supreme Lord" here means Ishvara, the concept of which transcends what you in the West mean by the personal God. "He from whom this universe proceeds, in whom it rests, and to whom it returns, He is Ishvara, the Eternal, the Pure, the All-Merciful, the Almighty, the Ever-Free, the All-Knowing, the Teacher of all teachers, the Lord who of His own nature is inexpressible Love."
