Cousin marriage law

Hi vin jee as per you tell you and your mother elder brother daughter this relation in hindu law probhited and came under spinda marriage so you cant marriage with your mother elder brother daughter 

as tell you in very simple word in relation she is your sister than how you marry with your sister 

and come in your blood relation so hindu law not permitted for this relation......

if the bride is the offspring of any person within five generations (inclusive) on the groom's father's side and three generations (inclusive) on the groom's mother's side, or vice versa, they will be referred to as "sapindas" of each other. In these cases, the Hindu Marriage Act of 1955 bars marriage between two such Hindus.

you are from which state.if you are from some south indian state then according to the prevalent custom it is allowed and you can also register such marriage under hma

hi your realtion come in probhited relation in hinu law according hindu law 1854 you Section 3 (f):. "Sapinda relationship" with reference to any person extends as far as the third generation (inclusive) in the line of ascent through the mother, and the fifth (inclusive) in the line of ascent through the father, the line being traced upwards in each case from the person concerned, who is to be counted as the first generation;  

THE FIRST SCHEDULE [ DEGREE OF PROHIBITED RELATIONSHIP]

PART – I

Mother. 
Father’s widow (step mother). 
Mother’s mother. 
Mother’s father’s widow (step grand-mother). 
Mother’s mother’s mother. 
Mother’s mother’s father’s widow (step great grand-mother).

Mother's father’s mother. 
Mother’s father’s father’s widow (step great grand-mother). 
Father’s mother. 
Father’s father’s widow (step grand-mother). 
Father’s mother’s mother. 

Father’s mother’s father’s widow (step great grand-mother). 
Father’s father’s mother. 
Father’s father’s father’s widow (step great grand-mother). 
Daughter. 
Son’s widow. 
Daughter’s daughter. 
Daughter’s son’s widow. 
Son’s daughter. 
Son’s son’s widow.
Daughter’s daughter’s daughter. 
Daughter’s daughter’s son’s widow. 
Daughter’s son’s daughter. 
Daughter’s son’s son’s widow. 
Son’s daughter’s daughter. 
Son’s daughter’s son’s widow. 
Son’s son’s daughter. 
Son’s son’s son’s widow. 
Sister. 
Sister’s daughter. 
Brother’s daughter. 
Mother’s sister. 
Father’s sister. 
Father’s brother’s daughter. 
Father’s sister’s daughter. 
Mother’s sister’s daughter. 
Mother’s brother’s daughter.

Explanation – For the purposes of this Part, the expression "widow" includes a divorced wife. so 

you need to read this 

thnks 

You can marry if there is a custom to this effect in the community.

Hi if theri any roule than  iam not aware of it 

so you follow the venu sir advice 

thnks