Any astrology predictions has to be done after taking PAC, that is Position, Aspects and conjunctions.
In simple terms 1st lord in 3rd house means , the person is courageous, have strong initiative to do something in life. If there is malefic influence then it means the person will not get along with brother / sister. 3rd house is also for speech, the native will enjoy singing if not professionally then as a hobby.
Lagan lord in 4th house, indicates attached towards family and home. The native will take care of his / her mother. He / she will want to live in place where he / she is born. Negative influence , indicates bad relationship with mother. The native wants to move away from his place of birth. The native can have heart related problems in life.