It is not necessary that if your mother is having type 2 diabetes then you will develop gestational diabetes.But you have to give more attention.Regular blood sugar  and HBA1c check is necessary Daily walk, light physical exercise is helpful Try some Yoga and meditation because it reduces anxiety.Anxiety increase blood sugar level due to hormonal changes. In diet    Take fiber rich diet                 Low carbohydrate diet.                 Take protein, iron, calsium rich diet.                  Avoid refined carbohydrates,cold drinks.                  Instead of juices take fresh fruits.                  Remain active throughout pregnancy.

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It's not sure ull get gestational diabetes due to family history. You might or might not. It's all depend on your pre- conception hba1 c levels and then in pregnancy your diet matters the most. It's detected by ogtt test. U can prevent it just by diet control.

Excercise regularly and diet control  will help to prevent  diabetes.

Sugar restricted diet to be taken. Brisk walking for 30 minutes 5 times a week

Not confirm that you will get .... To prevent avoid eating sugar/sweet.... And keep your weight in check

Yes you can prevent it by walking 45 minutes 5 days in a week and cut down on Sugar in take