For a father and son, we have junior/senior - are there complementary terms for a mother and daughter? Are junior/senior used? I have always thought of those as male-specific terms.
I work with a woman who is a Junior. We’ll call her Suzy Creamcheese Jr. She is female, this isn’t a transgender situation. That other name with the Jr is on all her paperwork. In a previous job at the company I dealt with payroll and personnel information on a parttime basis.
Yes, Senior and Junior apply to Mother and Daughter as well as Father and Son.
I haven’t heard of any Mother/Son or Father/Daughter names, but it’s possible, especially with non-gender-specific names.
My Mom and I have the same name. Neither of us use the Jr/Sr designation on the ends of our names, though it’s been used informally. Among family we are Little Obsidian and Big Obsidian, except for my father’s propensity to call us both by nicknames.
This has caused no end of trouble on so many levels. People/institutions are not geared for same-named women. Traveling together we’ve had airline tickets canceled, we’ve had orders canceled, the credit bureaus really want us to be the same person. . .
I can not wait until I get married next year and can have my very own name.
Maybe you can call yourself “Flake” because you are a chip off the old block of obsidian. 
My Dad had the same first and second names as his father and my mother had the same first and second names as her mother. Instead of using junior, they both simply switched their first and second names in day to day use. It was a bit confusing when asked at school for which name to use on official or religious forms.
Do you live in Milwaukee?
Oh do I know this feeling. At least you’re in a city; when I moved back to the small town I grew up in, it was a nightmare. I get her mail, banks/doctors/hairdressers get us mixed up when we call for appointments, I get phone calls for her, etc. etc. Add in that we bought a house from my parents, so I had her old address for a while. Did I mention my husband’s first name is the same as my father’s? Thankfully, neither of them go by it (my husband uses his middle name, and my father through some crazy idea of his mother’s is called a name that is not his legally at all), but as far as legal notices, mail, and other things, it was very confusing.
So yes, when we got married last summer, I was THRILLED to change my name! Yay! I’m my own person!
Let’s not take it for granite.
When I was a kid, there was a girl in my class named Susan Joanne Whatever, and her mother was also Susan Joanne Whatever. To make matters more confusing, the girl sometimes went by the name Susan and sometimes Joanne, and her mother also sometimes went by the name Susan and sometimes Joanne. I don’t remember whether they were both Susan or Joanne at the same time, or whether they alternated.
The entire family was definitely in the shallow end of the gene pool, for many reasons.
What. . . are you stoned or sumpin’?
In the comic strip Doonesbury, Joan’s daughter Joan Junior was called “JJ” for short.
Here’s a somewhat famous woman who is a Jr.:
So when the younger one gets married (or even the older one gets remarried) and changes her last name, do both the Sr and Jr titles drop or what?
I worked with a gentleman that had a twin brother. Their initials were the same, their first names were very close and sounded the same when spoken quickly, they of course had the same birthday, and to top it all, their US social security numbers were only one digit apart! Seeing as how in the past they had worked for the same company but on different floors, and looked very much alike even as adults, he had no end of hilarious stories to tell (example: one brother getting credit for twice the amount of college classes at graduation time, the other brother being told he could not graduate; brother A being dragged into a meeting by a new manager who got him mixed up with brother B; etc. etc.)
Here is a somewhat relevant thread.