Uk visa got refused due to unexplained deposits. How to re-apply? [duplicate]

My husband, my 4-year-old son and I as a family applied for a Family Visit visa last month to visit my husband's sister in UK. For documents we submitted everything that was required (employee certificate of my husband, bank statement, pay slips invitation letter from the family in UK, and tickets booking). The reason for refusal was a large deposit highlighted by them in the statement, which was indemnity or service money of deceased father of my husband. We got this from his company because my husband is the only son of his, and legal guardian of his mother and two sisters.

They rejected because of lack of evidence of this amount which we didn't provide them also they think that we will not leave UK and are trying to get entry in the UK. Although we have every evidence regarding money deposit and we are leaving behind our dependants in Saudi Arabia who are my husband's mother and sister, so we have their valid residents permit too. We are deciding to re apply for the visa with this evidence and support documents.

How far it's going to be approved?

⦁ THE DECISION

⦁ I Have refused your application for visit visa because i am not satisfied that you meet the requirements of paragraph V 4.2 of appendix V: Immigration rules for visitor because:

⦁ You proposed to travel to the UK for 45 days to visit your sister and her family. You have provided UK sponsor letter confirming your visit. In view of proposed close family visa i have therefore considered your application very carefully taking into full consideration the compassionate circumstances surrounding your application. I am however required to also assess your own personal, domestic and economic circumstances in determining whether you are a general visitor travelling to UK solely for the period and purpose you state.

⦁ I have noticed that you never previously travelled to UK or any other country with similiar immigration requirements,and you therefore do not have history of travel and compliance to consider.

⦁ As evidence of available funds, you have provided bank statements from NCB and riyad bank dated 18/11/2014 to 17/05/2015. You claim you are employed by ABC company and earning an average monthly salary of 2777 pounds. However I note that over this period there are salary payments are seen in the bank statement submitted. Furthermore there are large transfer and cash deposits which are six times your claimed salary. you have not provided evidence towards the origin of these recent deposits and in the absence of reasonable evidence. I am not satisfied that these bank statements accurately reflect your personal circumstances.

⦁ I have there been unable to assess your economic circumstances in KSA and as such i am not satisfied your income and circumstances are as you claim and therefore i am not satisfied that you are travelling to the uk for the period and purpose you state on this occasion.

⦁ I have therefore refused your application because i am not satisfied, on the balance of probabilities, that you meet all the requirements of the relevant paragraph V4.2 (a) (c) of the United Kingdom Immigration Rules.

⦁ Your right of appeal is limited to the grounds referred to in section 84(1)(c) of the nationality, Immigration and Asylum act 2002.