My sister is older after three years than my brother was five years ago;

8+3+5= 16 years old

My brother's age five years ago: 16÷(3- 1)=8 years old.

This year,

Brother: 8+5= 13 years old.

Elder sister: 13+8=2 1 year.

2.

According to the meaning of the question,

My mother is four times younger than Xiaohua and three years younger.

The age of the whole family is 3 years 4+4+ 1=9 times younger than that of Xiaohua.

This year,

Xiaohua: (78+3)÷(4+4+ 1)=9 years old.

Dad: 9×4=36 years old.

Sister: 36-3=33 years old

3.

Six years ago, Xiaojun was five times as old as Liang Xiao.

So far this year, Xiao Liang has increased by six years. If Jun Xiao increases 6×5=30 years old.

Then Xiao Jun is still five times as old as Xiao Liang.

In fact, Xiaojun's age has only increased by 6 years, with an increase of 30-6=24 years.

Jun Xiao is twice as old as Xiao Liang.

The age difference is 24 years.

Multiples differ by 5-2=3 times

So Xiao Liang is 24÷3=8 years old this year.

Small army this year: 8×2= 16 years old.

4.

The age difference between mother and lily is unchanged, which is 35- 10=25 years old.

When mom is six times the age of Lily,

Lili: 25(6- 1)= 5 years old.

Yes 10-5=5 years ago.

5.

The age difference between father and son is (8 1-3)÷3=26 years old.

at present

Dad: 8 1-26=55 years old.

Son: 55-26=29 years old